hardMultiple ChoiceObjective-mapped
XK0-006 Practice Question: A custom udev rule for a new USB device is not…
A custom udev rule for a new USB device is not being applied. The rule file is correctly placed in /etc/udev/rules.d/ with .rules extension. What is the most likely cause?
⚠ Common exam trap
Candidates often assume the rule file must be executable or that the device is not recognized, but the XK0-005 exam tests the understanding that udev rule matching is attribute-driven and that incorrect attribute values are the most common cause of non-application.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rule uses a wrong attribute or value
The most likely cause is that the rule uses a wrong attribute or value. Udev rules are matched against device attributes (e.g., vendor ID, product ID, subsystem) exposed by the kernel via sysfs. If the rule specifies an incorrect attribute name, a typo in a value, or a mismatch with the actual device properties, the rule will not trigger. Since the file is correctly placed and named, the failure is almost always due to a mismatch in the matching criteria.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The rule file is not executable
Why it's wrong here
udev rules files do not need execute permissions.
- ✓
The rule uses a wrong attribute or value
Why this is correct
Use 'udevadm info' to get correct attributes for matching.
- ✗
The device is not recognized by the kernel
Why it's wrong here
If the kernel doesn't recognize it, no rule can apply.
- ✗
The rule file is in a subdirectory
Why it's wrong here
The file is in the correct directory as stated.
Go deeper
Related to this question
Learn chapter
File Permissions and Ownership
Key term
Value
Value is the perceived worth, benefit, or usefulness that a service, product, or activity delivers to stakeholders, especially customers and the business.
Key term
udev
udev is a device manager for the Linux kernel that dynamically manages device nodes in the /dev directory, handling device insertion, removal, and event-driven configuration.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the XK0-006 exam.